Specifications

WM_PRJ_Q2501_PTS_001 – 003
March 2004
© 2003 All rights reserved
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This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior written
agreement.
Ce document est la propriété exclusive de WAVECOM. Il ne peut être communiqué ou divulgué à des tiers sans son
autorisation préalable.
This serial link is used for AT commands communication, for GSM function only
(external mode) or for both GSM and GPS functions (internal mode).
Pin description
Signal Pin # I/O I/O type Description
GSM_TXD1 59 I CMOS CT103 – Transmit Serial Data
GSM_RXD1 52 O 3X CT104 – Receive Serial Data
GSM_RTS1 50 I CMOS CT105 – Request To Send
GSM_CTS1 57 O 3X CT106 – Clear To Send
GSM_DSR1 56 O 3X CT107 – Data Set Ready
GSM_DTR1 54 I CMOS CT108-2 – Data Terminal Ready
GSM_DCD1 71 O CMOS/2X CT109 – Data Carrier Detect
GSM_RI1 74 O CMOS/2X CT125 – Ring Indicator
DTE
GSM_TXD1
GSM_RXD1
GSM_RTS1
GSM_CTS1
GSM_DSR1
GSM_DTR1
GSM_DCD1
GSM_RI1
GND
Q2501 GSM
Main Serial Link
Figure 13: Main GSM serial link signals
The WISMO Quik Q2501 has been designed to allow a certain flexibility in the
use of the serial interface signals.
However, the use of GSM_CTS1 and GSM_RTS1 signals for hardware flow
control in order to avoid data corruption during transmission is mandatory.
This is not the case for GSM_DTR1 and GSM_DSR1 signals which can be left
disconnected if not used.